Rotor assembly for screw pump
AssigneeHonda Giken Kogyo Kabushiki Kaisha
InventorsKatsunori Tajima, Mitsunori Arimura, Mamoru Yoshikawa, Tadashi Kimura
Life of this patent
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Abstract
A rotor assembly for a screw pump has a light alloy rotor main body having an axially extending central bore. A steel shaft is press-fitted into the central bore. A diametrically extending fixing pin is press-fitted through the rotor main body and the shaft. Friction forces between the rotor main body and the shaft are arranged to be larger on a discharge side of the rotor assembly than on a suction side thereof. The fixing pin is disposed at substantially a central position of entire friction forces in terms of their directions and magnitudes.
Claims9
A rotor assembly for a screw pump comprising a light alloy rotor main body having an axially extending central bore, a steel shaft frictionally connected by press-fitting into said central bore, and a diametrically extending fixing pin press-fitted through said rotor main body and said shaft, wherein friction forces between said rotor and said shaft are arranged to be larger on a discharge side of said rotor assembly than on a suction side thereof and wherein said fixing pin is disposed at substantially a central position of entire friction forces in terms of their directions and magnitudes.
A rotor assembly for a screw pump comprising a light alloy rotor main body having an axially extending central bore, a steel shaft frictionally connected by press-fitting into said central bore, and a diametrically extending fixing pin press-fitted through said rotor main body and said steel shaft, wherein:
- a first frictional connecting portion on a discharge side of said rotor assembly is made in a press-fitting construction between said main rotor body and said steel shaft by providing serrations on said shaft;
- a second frictional connecting portion on a suction side of said rotor assembly is made in a press-fitting construction;
- friction forces between said rotor and said shaft are arranged to be larger on said discharge side than on said suction side;
- a substantially central position of entire friction forces in terms of their directions and magnitudes is set to fall within a portion provided with said serrations;
- and said fixing pin is disposed at said substantially central position.
Dependencies are inferred from the claim text.